This study titled, “Influence of Social Studies Teachers Professional Training on Junior Secondary School Students? Performance in Kaduna State”. The study had fiveobjectives, five research questions, and five null hypotheses.The objectives were to determine the influence of knowledge of subject matter, use of instructional materials, use of communication skills, years of teaching experience and teacher professional qualifications on students? performance in social studies in Kaduna State, Nigeria. The study covered only social studies teachers within the three (3) senatorial zones of Kaduna State, namely zone one (1)Northern Kaduna, zone two (2)Kaduna Central and zone three (3)Southern Kaduna. The study reviewed related literature on behaviourist theory, constructivist theory, social learning theory, profession and characteristics of a professional teacher, teacher education and objectives. Others include, teacher and the world of education, concept of social studies, performance, elements of teaching effectiveness in social studies, effective teaching procedures in social studies and communication. Out of the three reviewed theories, the social learning theory was used as a guide to the study. Under empirical studies, the study reviewed research works that are related to the study, some of the studies shows that the variables investigated have significant influence on the performance of students. The study adopted descriptive survey design. Two thousand, two hundred and seventy one (2, 271) social studies teachers of public secondary schools formed the population of the study. A total of three hundred (300) social studies teachers selected from thirty (30) public secondary schools were sampled based on stratified sampling technique. The study adopted the stratified sampling technique. The instrument used to collect data was a fixed response questionnaire designed by the researcher. Frequency and percentages were used in analyzing the respondents? opinions, while one sample t-test was used to test the viii hypotheses at P<0.05 level of significance for acceptance or rejection and all the hypotheses were rejected. The findings revealed that knowledge of social studies, teachers? use of instructional materials in teaching and learning, teachers? communication skills, teachers years of teaching experience and teachers' professional qualifications have positive influence on the performance of students in social studies. Based on the findings, it was recommended amongst others, that focus should be made on improving teachers? performance through workshops on subject matter knowledge and on effective communication skills. Also, recruitment of teachers should be based on professional training and area of specialization.